So, protagonist is woman (possibly blonde) whos been out of touch with her brother for a long time.
I think she discovers he's dissapeared. When she goes to track him down she finds out he's been hanging out with some redneck gangster types. Follows his story to some blown up meth shed or something.
She suspects hes been murdered though, and actually finds his body in a swamp. After a while, she gets beaten up by a gang outside a barn (asking too many questions).
The whole thing closes with her other brother (I think) in a car with her, he admits hes found out who the killer is, and it fades out as he says he's going to kill him.